package kuang.collections;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

public class SetTest {
    public static void main(String[] args) {
        /**
         *
         */
        Set<String> set = new HashSet<>();
        Set<String> set1 = Collections.synchronizedSet(new HashSet<>());
        Set<String> set2 = new CopyOnWriteArraySet<>();
    }
}
